JobViewPart.java

/*
 * This file is part of the OpenSCADA project
 * Copyright (C) 2006-2010 TH4 SYSTEMS GmbH (http://th4-systems.com)
 *
 * OpenSCADA is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenSCADA is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenSCADA. If not, see
 * <http://opensource.org/licenses/lgpl-3.0.html> for a copy of the LGPLv3 License.
 */

package org.openscada.ae.ui.testing.views;

import java.util.Collection;
import java.util.LinkedList;

import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.ui.part.ViewPart;

public abstract class JobViewPart extends ViewPart
{

    private Collection<Runnable> taskList = null;

    protected abstract Realm getRealm ();

    protected void scheduleJob ( final Runnable runnable )
    {
        synchronized ( this )
        {
            boolean created = false;
            if ( this.taskList == null )
            {
                created = true;
                this.taskList = new LinkedList<Runnable> ();
            }
            this.taskList.add ( runnable );
            if ( created )
            {
                getRealm ().asyncExec ( new Runnable () {

                    public void run ()
                    {
                        JobViewPart.this.getRealm ().timerExec ( 1000, new Runnable () {

                            public void run ()
                            {
                                processQueue ();
                            }
                        } );
                    }
                } );

            }
        }
    }

    private void processQueue ()
    {
        Collection<Runnable> list = null;
        synchronized ( this )
        {
            list = this.taskList;
            this.taskList = null;
        }

        if ( list != null )
        {
            for ( final Runnable r : list )
            {
                r.run ();
            }
        }
    }

}